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{ // SELECT the original order request message from the OrderQueue // RETENTION makes it possible string sql = "SELECT CAST(message_body AS XML) FROM OrderQueue " + "WHERE conversation_group_id = @ConversationGroupID AND " + "message_type_name = " + "'http://ssb.csharp.at/SSB_Book/c09/OrderRequestMessage'"; SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Transaction = Transaction; // Create and set the parameters for the T-SQL command cmd.Parameters.Add("@ConversationGroupID", SqlDbType.UniqueIdentifier); cmd.Parameters["@ConversationGroupID"].Value = _conversationGroupId; // Execute the T-SQL command SqlDataReader reader = cmd.ExecuteReader(); if (reader.Read()) { // Get the <ShippingNode> from the original order request message SqlXml xml = reader.GetSqlXml(0); XmlDocument requestDoc = new XmlDocument(); requestDoc.LoadXml(reader.GetSqlXml(0).Value); reader.Close(); string shippingNode = requestDoc.SelectSingleNode("OrderRequest/Shipping").OuterXml; // Send the request message to the shipping service Conversation conv = this.BeginDialog("ShippingService", null, "http://ssb.csharp.at/SSB_Book/c09/ShippingContract", TimeSpan.FromSeconds(999999), false, ReceivedMessage.Conversation, Connection, Transaction); conv.Send(new Message( "http://ssb.csharp.at/SSB_Book/c09/ShippingRequestMessage", new MemoryStream(Encoding.Unicode.GetBytes(shippingNode))), Connection, Transaction); // The shipping request message was successfully sent _shippingMessageSent = true; } } }

Figure 8-27. Viewing the Distribution Agent security settings The wizard will now ask you to schedule the synchronization. Since this is a pull subscription, the Subscriber server makes the requests to receive the transactions, and the synchronization agent is usually run on demand or on a particular schedule. In this case, I chose to run on demand only, as shown in Figure 8-28. Click Next.

In the next wizard page, shown in Figure 8-29, you must check the box for the Replicate option; otherwise, the data changes made at the Subscriber server will not be sent to the Publisher server. Then make sure that the option Simultaneously commit changes is selected in the Commit at Publisher column. This is the default selection for publications created with updating subscriptions. Click Next to continue.

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You retrieve the original request message easily from OrderQueue with this code: // SELECT the original order request message from the OrderQueue // RETENTION makes it possible string sql = "SELECT CAST(message_body AS XML) FROM OrderQueue " + "WHERE conversation_group_id = @ConversationGroupID AND " + "message_type_name = " + "'http://ssb.csharp.at/SSB_Book/c09/OrderRequestMessage'"; SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Transaction = Transaction; // Create and set the parameters for the T-SQL command cmd.Parameters.Add("@ConversationGroupID", SqlDbType.UniqueIdentifier); cmd.Parameters["@ConversationGroupID"].Value = _conversationGroupId; // Execute the T-SQL command SqlDataReader reader = cmd.ExecuteReader(); More interesting is how OrderService processes the ShippingResponseMessage. This functionality is implemented in the ProcessShippingResponseMessage method of the OrderService class. You must determine the correct conversation handle that leads you back to the ClientService. You obtain the conversation handle from the sys.conversation_endpoints catalog view and create a new Conversation object that represents the ongoing conversation with ClientService. Finally, you send an OrderResponseMessage over this conversation back to ClientService. See Listing 9-20 for the detailed implementation. Listing 9-20. The ProcessShippingResponseMessage Method [BrokerMethod("http://ssb.csharp.at/SSB_Book/c09/ShippingResponseMessage")] public void ProcessShippingResponseMessage(Message ReceivedMessage, SqlConnection Connection, SqlTransaction Transaction) { XmlDocument doc = new XmlDocument(); doc.LoadXml(ReceivedMessage.BodyAsString); // Create the order response message XmlDocument responseDoc = new XmlDocument(); XmlElement root = responseDoc.CreateElement("OrderResponse"); root.InnerText = doc.GetElementsByTagName("ShippingResponse").Item(0).InnerText; responseDoc.AppendChild(root); // Create the T-SQL command to retrieve the conversation handle // back to the client service string sql = "SELECT conversation_handle FROM sys.conversation_endpoints " + "WHERE conversation_group_id = @ConversationGroupID " + "AND far_service = 'ClientService'"; SqlCommand cmd = new SqlCommand(sql, Connection); cmd.Transaction = Transaction;

Figure 7-15. Initiating publish of the cube browser 3. Select the correct URL for the document library to which you would like to publish the browser, and check the Open in Excel Services box. Figure 7-16 displays a view of this selection.

Note For queued updating subscriptions, follow the steps described for immediate updating subscriptions

cmd.Parameters.Add("@ConversationGroupID", SqlDbType.UniqueIdentifier); cmd.Parameters["@ConversationGroupID"].Value = _conversationGroupId;

so far, but select the option Queue changes and commit when possible in the Updatable Subscriptions page of the wizard (shown in Figure 8-29). The remaining parts of the configuration are the same as those for immediate updating subscriptions.

The wizard will now lead you to the login parameters for the linked server, as shown in Figure 8-30. (If you have not configured a linked server, the SQL Server replication process will create one for you.) You need to specify the login used by the Subscriber server to connect to the Publisher server when the Subscriber is simultaneously committing changes to replicated data. The login must be included in the PAL for this publication. Click Next to continue.

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